Spaceship exhaust light
3 things that you have to keep in mind:


You have to use the Filmic Color Management
The engine emission shader must be very bright and just a bit desaturated
You have to add a Glare node in "Node Editor" > "Compositing Nodes"


For the laser beam I've made this setup


The laser beam is just an elongated "drop" with a very bright green-yellow material. I've made the beam to move rapidly forward and i've enabled the motion blur option.